function initNav() {
	var navRoot = document.getElementById("navigation");
	var lis = navRoot.getElementsByTagName("li");
	for (var i=0; i<lis.length; i++) {
		lis[i].onmouseover = function() {
			if(this.className.indexOf("hover") == -1) {
					this.className += " hover";
				}
		}
		lis[i].onmouseout = function() {
			this.className = this.className.replace("hover", "");
		}
	}
}
if (document.all && !window.opera) {
	window.attachEvent("onload", initNav);
}

function viewPic(img)
{ 	
    picfile = new Image(); 
    picfile.src =(img); 
    fileCheck(img); 
}

function fileCheck(img)
{ 	
    if( (picfile.width!=0) && (picfile.height!=0) )
    { 
        makeWindow(img); 
    }
    else 
    {
        funzione="fileCheck('"+img+"')"; 
        intervallo=setTimeout(funzione,50); 
    }
}

function makeWindow(img)
{ 	
    ht = picfile.height + 20;
    wd = picfile.width + 20; 

    var args= "height=" + ht + ",innerHeight=" + ht;
    args += ",width=" + wd + ",innerWidth=" + wd;
    if (window.screen) 
    { 
        var avht = screen.availHeight; 
        var avwd = screen.availWidth;
        var xcen = (avwd - wd) / 2; 
        var ycen = (avht - ht) / 2;
        args += ",left=" + xcen + ",screenX=" + xcen;
        args += ",top=" + ycen + ",screenY=" + ycen + ",resizable=yes"; 	
    }
    return window.open(img, '', args); 
}